如何跟踪对象中的状态？ [英] How do I track states in an object?

问题描述

说我有一个类似

Say I have a class like

public class Student
    {
        public int ID { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public DateTime EnrollmentDate { get; set; }
    }

如何跟踪对象的不同状态，如新的，修改的，删除的，ucnahnged？

我我没有使用实体框架，而是使用dapper dot net。

How do I track different states to the object like if its New, modified, deleted, ucnahnged?
I am not using Entity framework but dapper dot net.

推荐答案

1.您可以使用Entity Framework来管理您的实体对象，并且所有状态都将自动管理;

或

2.您可以为州添加枚举，然后在您的班级中使用它，如下一个示例所示：

1.You could use Entity Framework to manage your entity objects, and all states will be managed automatically;
OR
2.You could add an enum for state then to use it in your class like in the next example:

public enum ObjectStates
{
Unchanged,
New,
Modified,
Deleted
}

public class Student
    {
 
public ObjectStates State
{
get;
private set;
}
public int ID 
{ get; 
set
{
this.State= ObjectStates.Modified;}
}
//... in all properties in the similar way!

public void Delete()
{
this.State = ObjectStates.Deleted;
//..
}
public void Save()
{
this.State = ObjectsStated.Unchanged;
//...
}
public Student()
{
this.State = ObjectStates.New;
}

public Student(...some params)
{
this.State = ObjectStates.Unchanged;
//...
}
    }

也许这会帮助你：

ObjectStateManager [ ^ ]，其中

Maybe this'd help you out :
ObjectStateManager[^], which

Quote：

维护实体类型实例和关系实例的对象状态和身份管理。

Maintains object state and identity management for entity type instances and relationship instances.

或者更确切地说，是什么模式实现，是吗？ :)

了解和实现C＃中的状态模式 [ ^ ]



- KR

Or rather, what pattern implementation, huh ? :)
Understanding and Implementing State Pattern in C#[^]

-KR

你见过 CSLA 吗？

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